Here are some of the other things I was considering. The aluminum pipe may have worked well if I had ordered shorter pieces. I was planning on cutting them, bending them and flaring the ends to fit 5/8 heater hose. Unfortunately, the pipe is narrower than 5/8 so the flare tool wouldn't work. Vintage Air sells different lengths, I would probably buy several of the shorter lengths (24" and less) determine which sizes to use and put the 5/8 flare end through the firewall to mount the hoses to. Then I would use the heater hose connectors from Vintage Air to connect the aluminum tubes to the heater core.
I also had hoped to use the heater hose bulkhead adaptor pictured, But I think that might only work if the engine is out and you had good access to that area.
I just didn't want to wait another week or more while I ordered the parts, so I made them out of copper tube and silicone heater hose.
Just some food for thought for those are considering this job
Gary #06984
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.